Re: [PATCH] powerpc/powernv/pci: add ifdef to avoid dead code

[Christophe Leroy]

Hi,

Le 14/06/2020 à 07:54, Greg Thelen a écrit :
Commit dc3d8f85bb57 ("powerpc/powernv/pci: Re-work bus PE
configuration") removed a couple pnv_ioda_setup_bus_dma() calls.  The
only remaining calls are behind CONFIG_IOMMU_API.  Thus builds without
CONFIG_IOMMU_API see:
   arch/powerpc/platforms/powernv/pci-ioda.c:1888:13: error: 
'pnv_ioda_setup_bus_dma' defined but not used
Add CONFIG_IOMMU_API ifdef guard to avoid dead code.

I think you should move the function down into the same ifdef as the 
callers instead of adding a new ifdef.

Christophe


Fixes: dc3d8f85bb57 ("powerpc/powernv/pci: Re-work bus PE configuration")
Signed-off-by: Greg Thelen <gthe...@google.com>
---
  arch/powerpc/platforms/powernv/pci-ioda.c | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c 
b/arch/powerpc/platforms/powernv/pci-ioda.c
index 73a63efcf855..f7762052b7c4 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1885,6 +1885,7 @@ static bool pnv_pci_ioda_iommu_bypass_supported(struct 
pci_dev *pdev,
        return false;
  }
  
+#ifdef CONFIG_IOMMU_API
  static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe, struct pci_bus 
*bus)
  {
        struct pci_dev *dev;
@@ -1897,6 +1898,7 @@ static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe 
*pe, struct pci_bus *bus)
                        pnv_ioda_setup_bus_dma(pe, dev->subordinate);
        }
  }
+#endif
  
  static inline __be64 __iomem *pnv_ioda_get_inval_reg(struct pnv_phb *phb,
                                                     bool real_mode)